When it comes to determining the longitudinal profile of sewers (or other underground piping) very precisely, inclinometry with a robot camera generally is not sufficiently accurate. In that case our LPMH system (Longitudinal Profile Measurement with Hydrostatic pressure) is the solution.

We carry-out these measurements with our own mobile units. To ensure accurate, autonomous operation the measurement unit is provided with its own liquid system. Each measurement is compensated for variations in temperature and atmospheric pressure. It is not necessary to empty the sewer. The measurements can take place while the sewer is in operation. It does not matter whether the pipe is dry or wholly or partly filled with water.

We carry-out these measurements with our own mobile units on a day rate basis.

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  LPMH System

In dual sewer systems faulty connections can cause unacceptably high pollution levels of the receiving surface water. For a proper functioning of the sewer system it therefore is important to locate any erroneous connections.

Distributed Temperature Sensing (DTS) is a very efficient method to do this. An optical fiber cable is pulled into the sewer and is left there during the monitoring period, usually a couple of weeks. A reading unit continuously launches a high frequency light pulse through the fiber and analyses the so-called Raman frequency in the backscattered spectrum. Variations in the intensity of this frequency have a direct mathematical relation to the temperature at any one point along the fiber. The resulting distributed temperature profile shows the location of any hotspots with an accuracy of one meter.

In cases where the application does not justify the purchase of a system we offer to carry-out these measurements with our own equipment.

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  DTS